▎ 摘　　要

NOVELTY - Blowing ventilating film comprises (i) taking each raw material, mixing calcium carbonate inorganic filler, mixing polyethylene base material and mixing auxiliary agent, melting and extruding to obtain a resin material, (ii) film blowing and molding, where the resin material made by the step (i) is blown film molding on a single screw film blowing machine to obtain a tubular film, (iii) air ring cooling, passing the tubular film through a double air ring film cooling device, and introducing through the gas medium into the inner space of the tubular film to expand and cool the tubular film, (iv) shaping the film, clamping the tubular film by herringbone plates and then folding by a transition roller, pre-heating the film to 70-90 degrees C, stretching and heat-setting to obtain a semi-finished ventilating film, and (v) passing the semi-finished breathable film between the pole plates with high voltage electricity in corona treatment. USE - The method is useful for blowing ventilating film. ADVANTAGE - The method: improves the air ring cooling and film shaping conditions to initially balance the hydrostatic pressure resistance, air permeability and moisture permeability of the ventilating film, and improves the hydrostatic pressure resistance of the ventilating film through corona treatment; and improves anti-hydrostatic pressure performance, air permeability and moisture permeability of the ventilating film jointly on the basis of high efficiency. DETAILED DESCRIPTION - Blowing ventilating film comprises (i) taking each raw material, mixing calcium carbonate inorganic filler, mixing polyethylene base material and mixing auxiliary agent, melting and extruding to obtain a resin material, (ii) film blowing molding, where the resin material made by the step (i) is blown film molding on a single screw film blowing machine to obtain a tubular film, (iii) air ring cooling, passing the tubular film through a double air ring film cooling device, and introducing through the gas medium into the inner space of the tubular film to expand and cool the tubular film, (iv) shaping the film, clamping the tubular film by herringbone plates and then folding by a transition roller, pre-heating the film to 70-90 degrees C, stretching and heat-setting to obtain a semi-finished ventilating film, and (v) passing the semi-finished breathable film obtained in step (iv) between the pole plates with high voltage electricity in corona treatment, bombarding the outer surface of the semi-finished film by the high voltage electricity, and trimming the edges and rolling to obtain the finished product.